Gear-cutting machine.



i W. B.'-YATES. GEAR CUTTING MAGHINE APPLICATION IILED MAY 18, 1908.

912,349. Patented Feb. 16, 1909.

WI Bl GEAR CUTTING MACHINE. APPLICATION FILED MAY 18 1906.

Patented Feb. 16, 1909.

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W. B. YATES. GEAR CUTTING MACHINE. APPLICATION FILED MAY 10, 1306.

Ptented Feb. 16,1909.

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- WITNESSES- W. B. YATES. om 00mm ncm'xl: APPLIUATIPI FILED KAY 18,1908:

Patented Feb. 16, 1909'.

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'uivrrnn s'rArns PATENT our! l GEAR-CUTTING MACHINE.

No. 912,349. Specification of Letters Patent.

Paten ,4 Feb. 16, 1909.

Application filed May 18, 1906.. Serial No. 317,506.,

To all whom it may concern: I having on its under surface gear teeth13*, Be it known that I,W1L1.m1u B. YATES, a these teeth mesh with theintermediate citizen of the United States, residing at 6458 transmissiongears C C whir h are supported Eggleston avenue, Chicago, in the countyof and revolve on the trunnions D D attached Cook and State of Illinois,have invented certo the indexing sleeve E. Meshing with tain new anduseful Improvements in (iearthese pinions C C is a gear CuttingMachines, of which the specification.

The object of this invention is an improved device for givingindependent rotary motion to a gear blank to be cut, the same beingsecurely supported and carried by the work chucking table or work arbor,when being operated on cutting spirally, thereby retaining intact theindexing mechanism, for indexing (also known as dividing) and the devicethe subject of this application for-giv'inga separate rotary motion,known in the art as spiral lead, further allowing a strong andsubstantial construction of arts, largely eliminating thereby defectsown as backlash and thus providing a machine capable of producing anincreased out ut.

In the description of t 's device like letters refer to like parts inthe several views which consist of- Figure 1 Sheetl a cross section of.this device. Fig. 2 Sheet 1 an end view of the base showing change geararrangements. Fi 3 Sheet 2 a longitudinal elevation of the u ley side ofthe machine. Fig. 4 Sheet 3 a longt the opposite side of the machine andthe Fig. 5 Sheet 4 a modifica tion of the parts using spur and spiralgears instead of bevel and spiral gears, this modi fication in nowayvitiating the essence of the following is a l of the lead controllingsleeve F on the periphery of which is a worm gear W, G being the wormkeyed on the gear shaft G giving to F in either direction.

Keyed to E is the indexing worm ear H which receives motion from thewound; this worm is supported in an independent hear ing in order thatit may be disengaged from 1-1 when .so desired. Keyed on the wormspindle J to which the worm I is keyed isa tooth pinion. J which isrotated by and in mesh with pinion K secured to change gear shaft Ktively with that of the feed of the cutter carshaft G in relation tothat of shaft L is determined by suitable change gearing on and betweenthese two shafts according to the spiral lead required, such as shown atl, 1.

Change gear shaft K receives its motion binations of gearing andmechanisms common in such machines, such as shown at Ir, 7a.

In givin requisite motion to the shafts G and Kfl l do not limit myselfto any particular forms of mechanism as many suchare in daily use andare common property.

'I he operation of my machine is as follows: A gear blank is firmlysecured to the chucking table and the proper change gears for indexingthe number of teeth to be out, also the char: ge gears and mechanisms togive the desired lead of spiral, determined and placed Figs; 2, 3, and 4show also connections such as change gear arrangements, indexing stopmechanism, cutter carriage, cutter carriage feed and return arrangementsetc., all component arts of a gear cutting machine and in whic thisinvention has no claim inthe se arate and varied characteristics ofthese evices known to the'art and many subject of expired patents,further than in the combination with my invention for a 1 machine,therefore no spel in g. cial reference is made to them by letter or F bynumber as the essence of this invention lies i not in the details of anyof the many ar- 1 rangements, but in those parts of a gear {gears C Crotating them on their respective cutting machine illustrated, describedand l studs D D which are a part of the indexing claimed. sleeve Econtrolled and held firmly in posi- Referring to Fig. 1 Sheet 1 A is thebase of tion o t ind x the machineD is the work chucking table C C are ain mesh with the gear wheel B F which is a part Change gear shaft Greceives its moiion from shaft L whose speed is controlled rela-- riageand of its return and the speed of the from the pulley shaft throughsuitable comrespectively. 'lhe machinebeing given mois rotating givingmotion to vibratory rotary, or continuous rotary motion being onecomposite member)motion to m5: worm I. These pinions secured toihe underside of the chucking table B and thus impart to it the lead motion givento them by the gear F Indexing and lead can be in operation at the sametime, the gears C C simply moving a determined number of degrees due tothe amount of in-' dex motion given. It is further seen a continuousmotion when using a hob cutter can be given by either or both shafts Gand K hey may be used together-in augmenting or decreasing motion.Motion is given to the cutter and cutter carriage, and the angularity ofthe cutter provided for by any of the many arrangements now in use.

Having described the nature and purpose of my invention what I claim asnew and desire secured to me by the Letters Patent is 1. A gear cuttingmachine comprising a rotatable arbor having a chucking table thereon,indexing and lead-controlling sleeves concentrically mounted thereon, anintermediate gear {ournaled upon one sleeve and engaging sair table andsaid other sleeve res ectively, and means for simultaneously andindependently rotating saidsleeves. V

, 2. A gear cutting machine comprising a chucking table rotatablysupported in a suit- ,see

thereby and having gear teeth thereon, an indexing sleeve journaled onsaid arbor carrying a pinion inmesh with said gear, a leadcontrolhngsleeve -j ournaled on said indexing sleeve and having gear teeth in meshwith said inion, and means arranged to rotate said sleeves independentlyin either direction.

4. A gear cutting machine comprising a rotatable arbor, a chucking tablecarried thereby and having gear teeth thereoinan indexing sleevejournaled on said arbor carrying a pinion in mesh with said gear, aleadcontrolling sleeve journaled on. said indexin sleeve and having gearteeth in mesh with said pinion, worm gears on each of said sleeves andseparate Worms in mesh with said worm gears. j

5. A gear cutting machine comprising a rotatable arbor, a chucking tablecarried thereby and having gear teeth thereon, an indexing sleevejournaled on said arbor carrying a pinion in mesh with said gear, aleadcontrolhng sleeve j ournaled on said indexing sleeve and having gearteeth in mesh with said pinion, a gear on said indexing sleeve, a wormin mesh with said gear and connected with an indexing device, and meansfor con-= necting said lead-controlling sleeve with a change-gear shaft.

In testimony whereof I have afiixed my signature, in presence of twowitnesses.

WILLIAM B. YATES.

Witnesses R. W. Yarns, B. V. BANE.

